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An abnormal heart rhythm is when your heart beats too fast, slow, or irregularly. This is also called an arrhythmia. Within the heart is a complex system of valves, nodes, and chambers that control how and when the blood is pumped. An abnormal heart rhythm is when your heart beats too fast, slow, or irregularly.
Other symptoms may include shortness of breath on exertion or chest pain. If there is an electrical rhythm disturbance associated with the cardiomyopathy, abnormal heartbeats may cause palpitations and the sensation of an occasional skipped heart beat or lethal heart rhythms, such as ventricular fibrillation.